Turn Off Notification to Requester

Turn Off Notification to Requester

Hi,
 
I am wondering if its possible to turn-off notifications to requester for certain type of request? I have created a new request template with an extra field called "Enable Notification", and the user can only select 2 values for this field: Yes or No. I wonder if its possible to stop all notifications to requester if the custom "Enable Notification" field is set to "No". I tried to set junk notification criteria but the only criteria I can use is subject, sender, description. Is it possible to add custom field to the notification criteria? Are there any other ways to do this? ie through business rules?
 
If I set junk notification criteria to filter out certain keywords, will there be notification to the requester if the request is closed?
 
 
Regards,
 
Jerry

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